size, whereas the corresponding one on the other side has already reached or 

 almost reached its final size (Fig. 253). The posterior outgrowth of the 

 attaching disc, containing in it 2 pairs of middle hooks and one pair of 

 edge hooks which do not change, is preserved until the time of formation 



Fig. 254. Microcotyle 

 gotoi Yamaguti, a larva 

 with two pairs of clamps in 

 the cercomere from the 

 gills of Hexagrammos 

 octogrammus (Pal. ) 

 from the region of 

 Yablichnoii (southern 

 Sakhalin, Sea of Japan). 



Fig. 255. Microcotyle gotoi Yamaguti, 

 young worms with two pairs of clamps and 

 the drop-shaped remnant of a cercomere 

 with a vacuolized posterior end from the 

 gills of Hexagrammos octogrammus (Pal.) 

 from the region of Yablichnoii (southern 

 Sakhalin, Sea of Japan). 



of the 2 pairs of attaching clamps. At that time its parenchyma is 

 strongly vacuolated and this part of the disc (cercomere!) falls off 

 (Fig. 254). Immediately following this a small, drop-shaped growth 



Fig. 256. Microcotyle gotoi Yamaguti, stages of development of young 

 worms from the gills of Hexagrammos octogrammus (Pal. ) from the 

 region of Yablichnoii (southern Sakhalin, Sea of Japan). 



D. 213 



232 



